our charlie d'agata is in benghazi tonight. charlie, what more are you hearing about who is responsible? >> well, a top libyan official told us today, jeff, that members within the militant groupance ar-al shariya are suspects in this attack including some individuals still at large. but was quick to point out that some factions of that group may be the responsible for the murders of ambassador stevens and three of his team, not all members took part in the attacks. >> jeff: i think a lot of people might wonder what kind of support does ansar-al shariya receive in libya? >> well, jeff, like many brigades here, they are responsible for the day-to-day running of benghazi, particularly when it comes to providing security here. as a matter of fact, even today we saw their trucks with their insignia on the side parked outside the area hospitals providing security there. but as their name states, they are supporters of shariya law, strict islamic law which goes against some of the principleses of democracy. that has made them unpopul